Pre-Heated Pressurized Solar Water Heater
Evacuated Tube
Pre-Heated Pressurized
Solar Water Heater
SolarMaster SPP series of Pre-Heated Pressurized Solar Water Heater are suitable for both residential and commercial applications.
The design of the SPP Pre-Heated Pressurized Solar Water Heater is a culmination of nearly 15 years of feedback from installers and solar professionals all over the world and aims to meet their requirements with the following key features:
● Hot water goes out with high pressure 
● Completely automatic operation
● The water can be heated rapidly
● Combined the heat exchanger into the Non-pressure system
● No risk for corrosion or scale deposit 
● Economical compare with other pressurized system
● Gas or electrical boost options are available
● High wind load strength and High snow load strength
SPP system are available from 150-300L sizes and have a number of options depending on the local market requirements.
Model SPP-15 SPP-20 SPP-25 SPP-30
Size A 1350mm  1585mm  2158mm  2510mm 
Size B 1410mm 1532mm 1963mm 2310mm
Size C 1550mm 1550mm 1550mm 1550mm
Size D 1600mm 1600mm 1600mm 1600mm
Size E 2010mm 2010mm 2010mm 2010mm
Peak Output * 1009W  1335W  1667W  2019W 
Gross Area
2.40 m2
3.17 m2 3.93 m2 4.70 m2
System Capacity 150 L 200 L 250 L 300 L
Tube Quantity 15 20  25 30
*Calculated at midday (trans IAM = 1), G=1000W/m2, ∆T (tm-ta)=0, Location is in Jinxing, China
How It Works
Step 1:
Solar glass tubes absorb solar radiation and converts radiation to heat energy.
Step 2:
As to the thermosiphon principle, the hot water from the tubes goes into water tank, while the cold water from the tank goes down to the tubes.
Step 3:
The cold water goes into the copper coil inlet, be heated by the hot water of the inner tank, and go out from the outside of copper coil
Step 4:
People do not use the hot water directly from the water tank, they use the hot water from the inside of copper coil.
Tank Structure
Main Component
                                                           Materials & Specifications                                                            
Evacuated Tubes
Material: Borosilicate 3.3
Tube style: Twin wall all glass
Dimensions: ∅58mm outer tube; ∅47mm inner tube;  1.8m length, 1.65mm outer tube wall thickness
Solar Absorber Coating
Material: Graded AL/N on AL
Absorptance: >92% (AM1.5); 
Emittance: <8% (80 C)
Vacuum: P<5×10-5 Pa;
Heat loss: <0.8W/(m2 C)
Water Tank
Outer Tank: Φ470mm, Stainless Steel 304-BA or 201-BA or Color Steel , 0.4mm thickness
Inner Tank: Φ360mm, Stainless Steel 304-2B or 316L, 0.4mm thickness
Insulation Layer: 55mm thickness, High density Polyurethane Foam from Germany
Operating temperature: 55-95 C             
Startup temperature: 0 C
Rubber Components
Material: HTV Silicone Rubber (UV stabilized)
Mounting Frame
Material: Stainless Steel 304-BA or 201-BA or Aluminum alloy or Galvanised Steel